Really confused need help!

Cassandra

So i had sex twice during fertile window. I'm about 7 dpo now an for the last 4 days I've had brown/ red spotting. Went from a few drops to now needing a panty liner. Seems way to soon to be implantation bleeding but also way to early to be my period which is not due for 10 days an I always have a 28 day cycle. I'm just very lost an confused to what this might be. Any ideas or input would help please.